Senior Backend Engineer (C#/.NET and Python) / Architect

We are CirrusLabs. Our vision is to become the world's most sought-after niche digital transformation company that helps customers realize value through innovation. Our mission is to co-create success with our customers, partners and community. Our goal is to enable employees to dream, grow and make things happen. We are committed to excellence. We are a dependable partner organization that delivers on commitments. We strive to maintain integrity with our employees and customers. Every action we take is driven by value. The core of who we are is through our well-knit teams and employees. You are the core of a values driven organization.

You have an entrepreneurial spirit. You enjoy working as a part of well-knit teams. You value the team over the individual. You welcome diversity at work and within the greater community. You aren't afraid to take risks. You appreciate a growth path with your leadership team that journeys how you can grow inside and outside of the organization. You thrive upon continuing education programs that your company sponsors to strengthen your skills and for you to become a thought leader ahead of the industry curve.

You are excited about creating change because your skills can help the greater good of every customer, industry and community. We are hiring a talented to join our team. If you're excited to be part of a winning team, CirrusLabs (http://www.cirruslabs.io) is a great place to grow your career.
Role Summary

Lead the design and development of scalable backend services and APIs built with C#/.NET and Python, hosted on AWS EKS with MongoDB. You will own solution architecture, mentor engineers, drive CI/CD with GitHub Actions and Argo CD, and ensure reliability, security, and observability (Dynatrace or similar). This role requires strong leadership, stakeholder management, and excellent presentation/demo skills within an Agile SAFe environment.

Key Responsibilities

• Architect, design, and deliver backend microservices and APIs (REST/GraphQL) on AWS EKS.
• Lead technical design documents, architecture diagrams, and ADRs; present and gain alignment with stakeholders.
• Implement CI/CD pipelines using GitHub Actions; manage GitOps-based deployments via Argo CD.
• Model, optimize, and operate MongoDB for performance, availability, and scalability.
• Establish service reliability practices: SLOs/SLIs, alerting, runbooks, and incident response.
• Ensure security-by-design: secrets management, IAM least privilege, API security, and compliance with best practices.
• Drive code quality (reviews, standards), testing strategy (unit, integration, contract, performance), and documentation.
• Collaborate cross-functionally with Product, UX, QA, DevOps, and Security; influence roadmaps and trade-offs.
• Mentor and coach engineers; lead backlog refinement, PI planning, and delivery in SAFe.
• Prepare and deliver clear technical presentations and live demos to leadership and clients.

Required Qualifications

• 10-12 years of professional software engineering experience with at least 5+ years focused on backend systems and distributed architectures.
• Strong programming expertise in C#/.NET and Python for production services.
• Proven experience designing and operating containerized services on Kubernetes (AWS EKS).
• Hands-on MongoDB expertise: schema design, indexing, aggregation, transactions, performance tuning, and operational management (e.g., Atlas or self-managed).
• Demonstrated CI/CD ownership with GitHub Actions and GitOps deployments via Argo CD.
• Advanced AWS knowledge: EKS, ECR, IAM, VPC, ALB/NLB, Route 53, CloudWatch/CloudWatch Logs, Secrets Manager/Parameter Store, S3.
• API design and lifecycle management: versioning, pagination, rate limiting, authentication/authorization (OAuth2/OIDC/JWT), documentation (OpenAPI/Swagger).
• Observability and APM with Dynatrace or similar tools; metrics, logs, traces, dashboards, and alerting.
• Leadership experience: mentoring, guiding technical direction, influencing stakeholders, and leading delivery in Agile SAFe.
• Excellent communication, documentation, presentation, and demo skills.

Technical Skills

• Languages/Frameworks: C#/.NET 6+ (ASP.NET Core), Python 3.x (FastAPI/Flask), LINQ, async patterns.
• APIs/Integration: REST, SOAP and GraphQL, Webhooks, idempotency patterns, circuit breakers, retries, and backoff.
• Data: MongoDB (replica sets, sharding, TTL collections), schema versioning, aggregation pipelines; caching (Redis) preferred.
• Cloud/Kubernetes: Kubernetes fundamentals (deployments, services, ingress, config/secrets), Helm/Kustomize, autoscaling (HPA/Cluster Autoscaler), pod security, network policies.
• CI/CD & DevOps: GitHub Actions workflows, Argo CD applications and sync strategies, artifact versioning, environment promotion, blue/green and canary releases.
• Observability: Dynatrace; familiarity with OpenTelemetry, log shipping (Fluent Bit), and tracing best practices.
• Security: IAM, KMS, container image scanning, vulnerability management, OWASP ASVS, SAST/DAST integration into pipelines.
• Testing: unit/integration, contract testing (e.g., Pact), load/performance (k6/JMeter), chaos/resilience testing (preferred).

Preferred Qualifications

• Experience with event-driven architectures and messaging (RabbitMQ,Kafka/SNS/SQS).
• Cost optimization and capacity planning on AWS.
• Infrastructure as Code exposure (Terraform/CloudFormation) and policy-as-code (OPA) is a plus.
• Experience with additional APM/observability tools (Datadog, New Relic, Prometheus/Grafana).
• Prior experience operating high-availability, high-throughput services in regulated or enterprise environments.

Certifications (Preferred)

• AWS Certified Solutions Architect (Associate/Professional) or AWS Certified DevOps Engineer.
• MongoDB Certified Developer or DBA.
• Kubernetes (CKA/CKAD) and/or GitHub Actions/Argo CD ecosystem certifications.

Ways of Working

• Agile SAFe ceremonies: PI Planning, Sprint Planning, Reviews, Retros, System Demos.
• Git-based workflows (feature branches, PR reviews, trunk-based where applicable).
• Documentation-first mindset: technical design docs, API specs, and operational runbooks.
• Ownership of services through build-run lifecycle, including on-call participation as needed.